Venezuela's armed forces said Tuesday they were on "alert" for border violations following threats by US President Donald Trump who urged them to back opposition leader Juan Guaido. "The armed forces will remain deployed and on alert along the borders... to avoid any violations of territorial integrity," said Defense Minister Vladimir Padrino, reading out a statement in a public appearance alongside top commanders. "We reiterate unrestrictedly our obedience, subordination and loyalty" to President Nicolas Maduro, he added.